Modelling, Simulation and Verification of 4-phase Adiabatic Logic Design: A VHDL-Based Approach

The design and functional verification of the 4-phase adiabatic logic implementation take longer due to the complexity of synchronizing the power-clock phases. Additionally, as the adiabatic system scales, the amount of time in debugging errors increases, thus, increasing the overall design and verification time. This paper proposes a VHDL-based modelling approach for speeding up the design and verification time of the 4-phase adiabatic logic systems. The proposed approach can detect the functional errors, allowing the designer to correct them at an early design stage, leading to substantial reduction of the design and debugging time. The originality of this approach lies in the realization of the trapezoidal power-clock using function declaration for the four periods namely; Evaluation (E), Hold (H), Recovery (R) and Idle (I) exclusively. The four periods are defined in a VHDL package followed by a library design which contains the behavioral VHDL model of adiabatic NOT/BUF logic gate. Finally, this library is used to model and verify the structural VHDL representations of the 4-phase 2-bit ring-counter and 3-bit up-down counter, as design examples to demonstrate the practicality of the proposed approach

Synchronised 4-Phase Resonant Power Clock Supply for Energy Efficient Adiabatic Logic

International audienceAdiabatic logic is an alternative architecture design style to reduce the power consumption of digital cores by using AC power supply instead of DC ones. The energy saving of the digital gates is strongly related to the efficiency of adiabatic AC power supplies. In this paper, we propose a resonant reversible power-clock supply design with four different phases. The resonance deviation between the four power-clock supplies is synchronized thanks to 12 control signals (3 controls signals per power-clock supply). We derive the energy dissipation of a 4-stage PFAL pipeline circuit supplied with the proposed resonant powerclock supply, which can dissipate up to 2.9 times less energy than a non-adiabatic CMOS pipeline